Rainfall Extremes

The longest wet spell averages 11 days with range from 7 to 24 days. On the other hand, the longest dry spell averages 88 days with range from 52 to 152 days.

The highest 24-hr rainfall ranges from about 98.3 to 498 mm. Likewise, the highest monthly rainfall ranges from about 333 mm to 1406 mm.

Daily and monthly rainfall extremes and duration of longest dry and wet spell (1976-2006)

Year HIGHEST DATE HIGHEST DATE LONGEST NO. LONGEST NO.
  24-hr   MONTHLY   WET OF DRY OF
          SPELL DAYS SPELL DAYS
  mm   mm   a   b  
1976 128.3 25 May 333.1 Jul 21 Jul-03 Aug 14 01 Jan-25 Apr 115
1977 205.0 20 Sept 873.8 Sept 14 Aug-25 Aug 12 11 Feb-19 Apr 67
1978 98.3 23 Sept 326.3 Aug 30 Jul-13 Aug 15 01 Jan-13 Apr 103
1979 163.6 03 July 469.8 Aug 24 Jul-16 Aug 24 01 Jan-13 Apr 135
1980 221.4 09 July 467.4 July 10 Sept-20 Sept 11 31 Jan-15 May 97
1981 207.4 12 June 624.3 June 01 June-16 June 16 01 Jan-01 May 121
1982 152.4 13 Aug 739.2 July 28 June-06 July 9 01 Jan-03 May 123
1983 209.6 06 Sept 606.0 Aug 11 Aug-19 Aug 9 29 Oct-29 Dec 62
1984 220.0 28 Aug 827.4 Aug 14 Aug-20 Aug 7 01 Jan-28 Feb 59
1985 391 26 Aug 1022.6 Aug 16 Aug-29 Aug 14 01 Jan-05 May 125
1986 448.2 02 Sept 1407.4 Aug 27 May-04 June 9 02 Jan-26 Mar 84
1987 483.0 24 Oct 1046.3 Oct 12 Jul-19 Jul 8 01 Jan-01 June 152
1988 123.0 18 July 412.1 July 26 May-03 June 9 18 Feb-12 May 84
1989 221.8 06 Oct 864.8 Sept 07 Sept-14 Sept 8 01 Jan-24 Feb 55
1990 326.0 29 Aug 1176.0 Aug 23 May-04 June 13 18 Mar-16 May 60
1991 215.0 12 Aug 560.0 July 14 Sept-22 Sept 9 01 Jan-16 Mar 75
1992 358.4 21 Sept 826.0 Sept 14 Aug-20 Aug 7 27 Oct-31 Dec 66
1993 293.8 15 Sept 517.8 Sept 10 Jul-19 Jul 10 01 Jan-12 May 132
1994 418.4 10 Sept 804.4 July 29 June-13 Jul 16 13 Oct-31 Dec 79
1995 192.4 30 Aug 571.4 Aug 25 Aug-01 Sept 8 01 Jan-08 May 128
1996 498.0 25 Jul 1038.6 Jul 21 Jul-04 Aug 15 26 Jan-18 Apr 84
1997 175.0 06 Aug 545.6 Aug 29 May-05 June 7 25 Jan-17 May 113
1998 181.0 15 Oct 394.0 Sept 05 Sept-17 Sept 13 17 Jan-18 Apr 98
1999 293.0 05 June 527.8 June 10 sept-23 Sept 14 01 Jan-06 Mar 65
2000 224.2 22 Aug 1136.6 July 26 Aug-05 Sept 11 10 Mar-11 May 63
2001 330.0 04 July 752.1 Sept 01 Sept-10 Sept 10 01 Jan-21 Feb 52
2002 187.2 11 July 854.6 July 23 May-09 June 18 09 Nov-31 Dec 53
2003 172.4 16 Jun 522.5 Aug 02 Aug-09 Aug 8 23 Jan-21 Apr 89
2004 258.0 30 Jun 738.6 Aug 02 June-09 June 8 01 Jan-07 May 106
2005 344.8 21 Sept 586.1 Sept 22 June-01 Jul 10 01 Jan-09 May 129
2006 186.2 12 Jul 919.6 Jul 06 Jul-14 Jul 9 02 Mar-20 Apr 50

a = continuous period with at least 0.5 mm daily rainfall

b = continuous period with less than 0.5 mm rainfall